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I've been servcing and installing lennox equipment for 10 years now and I just replaced my 15th heat exhanger for the G20 wisper heat. dont get me wrong, i love the G26, 51, 60 and especially the 61. But I just can't escape the 15 and 20 wisper nightmare. anyone else feel me? lol

Yeah I find the dura curve a lot. U know what I'm talking about, I found 5 cracks in the one today. Very visable. I had my guys take a good look at them. I water test and use a camera on all mine so the customer can see. It's all warenty, but It never hurts for them to see

Correct me if I'm wrong, but the older models were straight steel and generally rusted to death but didn't crack. and the newer models are aluminized steel for corrosion resistance but crack constantly.